As an additional option - in case you need to keep those lines at their repsective elevations - you can use the APParent object snap where it finds the intersection of two objects crossing each other with different elevations.
When you need to snap to the intersection of these objects, enter APP on the keyboard (or however you enter an OSnap), hover your cursor over one of the objects [a glyph will appear] and click anywhere along that object, then hover your cursor over the crossing object, and the "Apparent Intersection" glyph will appear at the intersection where you will then click your mouse button.
Note that whichever object you click on first will act as the reference line and will snap it its 'Z' value. In other words, if you have an object at elevation 15, and another object at elevation 10, if you click on the elevation 15 object first, your cursor will snap at elevation 15.
And also note that the endpoints of both objects can have different Z elevations, and APParent INTersection stills works as expected
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